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About Sound Insulation and Sound Insulation Materials

Sep. 25, 2020

In daily life, every time the building is far away from the street or the noise pollution source double the distance, the noise can be reduced by 6dB, and the green trees in the community can reduce the noise by about 4dB. Acoustic materials manufacturer shares with you.

Noise propagation

Noise transmission can take two forms: airborne noise and solid-borne noise.

1. Airborne noise

The most basic way of sound wave propagation is air propagation, and airborne noise is the noise that the outside noise is transmitted into the room through the air. A thick metal plate with small holes, the area of the small holes accounts for about 13% of the metal plate, when a sound hits its surface, nearly 97% of the sound will pass through. The ability of sound to propagate through pores is quite amazing, and a tiny crack can destroy a complete sealed acoustic system. Therefore, strict sealing of the room is very necessary to isolate air noise.

Acoustic Insulation Materials

2. Solid-borne noise

Sound can be transmitted through the mechanical vibration of solids, such as wood, metal, concrete, etc. Because the airborne sound transmission efficiency is very low and it is difficult to drive the solid vibration, the main source of solid-borne noise is due to the vibration source contacting the surface of the solid medium, such as underground generators or some household appliances. The loss of solid-borne sound is smaller than that of air-borne sound, and it can travel a very long distance without large energy loss. The longitudinal vibration of wood, concrete, etc. is about 304.8 meters and the loss is about 2dB. If the transmission medium is steel, the loss will be reduced by 20 times.

Sound insulation treatment

There are many methods for sound insulation. Because of the strict requirements for background noise in recording studios, suspended structures are often used. The suspension structure can greatly improve the sound isolation, which is especially suitable for recording studios in cities. The suspended structure can separate the room from other building structures, so that a cavity can be formed between the suspended wall and the original wall. The cavity is filled with soft sound-absorbing materials, and the cavity is used to absorb sound waves, thereby reducing air and solid noise to at the lowest limit. But the suspended structure must meet the load-bearing requirements of the building.

Acoustic insulation materials generally reflect more sound, so they are generally denser materials.


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